Package having different metal densities in different regions and manufacturing method thereof

ABSTRACT

A package has a first region and a second region encircled by the first region. The package includes a first die, a second die, an encapsulant, and an inductor. The first die is located in both the first region and the second region. The second die is bonded to the first die and is completely located within the first region. The encapsulant laterally encapsulates the second die. The encapsulant is located in both the first region and the second region. The inductor is completely located within the second region. A metal density in the first region is greater than a metal density in the second region.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation application of and claims the priority benefit ofU.S. application Ser. No. 17/684,431, filed on Mar. 2, 2022, nowallowed. The prior U.S. application Ser. No. 17/684,431 is acontinuation application of and claims the priority benefit of U.S.application Ser. No. 16/929,118, filed on Jul. 15, 2020, now patented.The prior U.S. application Ser. No. 16/929,118 claims the prioritybenefit of U.S. provisional application Ser. No. 62/892,558, filed onAug. 28, 2019. The entirety of each of the above-mentioned patentapplications is hereby incorporated by reference herein and made a partof this specification.

BACKGROUND

Semiconductor devices and integrated circuits used in a variety ofelectronic apparatus, such as cell phones and other mobile electronicequipment, are typically manufactured on a single semiconductor wafer.The dies of the wafer may be processed and packaged with othersemiconductor devices or dies at the wafer level, and varioustechnologies and applications have been developed for the wafer levelpackaging. Integration of multiple semiconductor devices has become achallenge in the field.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the followingdetailed description when read with the accompanying figures. It isnoted that, in accordance with the standard practice in the industry,various features are not drawn to scale. In fact, the dimensions of thevarious features may be arbitrarily increased or reduced for clarity ofdiscussion.

FIG. 1A to FIG. 1K are schematic cross-sectional views illustrating amanufacturing process of a package in accordance with some embodimentsof the disclosure.

FIG. 2A is a schematic top view of FIG. 1C.

FIG. 2B and FIG. 2C are respectively schematic top views of FIG. 1C inaccordance with some alternative embodiments of the disclosure.

FIG. 3 is a schematic top view of FIG. 1I.

FIG. 4 is a schematic cross-sectional view illustrating a package inaccordance with some alternative embodiments of the disclosure.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, orexamples, for implementing different features of the provided subjectmatter. Specific examples of components and arrangements are describedbelow to simplify the present disclosure. These are, of course, merelyexamples and are not intended to be limiting. For example, the formationof a first feature over or on a second feature in the description thatfollows may include embodiments in which the first and second featuresare formed in direct contact, and may also include embodiments in whichadditional features may be formed between the first and second features,such that the first and second features may not be in direct contact. Inaddition, the present disclosure may repeat reference numerals and/orletters in the various examples. This repetition is for the purpose ofsimplicity and clarity and does not in itself dictate a relationshipbetween the various embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath,” “below,” “lower,”“above,” “upper” and the like, may be used herein for ease ofdescription to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the figures. The spatiallyrelative terms are intended to encompass different orientations of thedevice in use or operation in addition to the orientation depicted inthe figures. The apparatus may be otherwise oriented (rotated 90 degreesor at other orientations) and the spatially relative descriptors usedherein may likewise be interpreted accordingly.

Other features and processes may also be included. For example, testingstructures may be included to aid in the verification testing of the 3Dpackaging or 3DIC devices. The testing structures may include, forexample, test pads formed in a redistribution layer or on a substratethat allows the testing of the 3D packaging or 3DIC, the use of probesand/or probe cards, and the like. The verification testing may beperformed on intermediate structures as well as the final structure.Additionally, the structures and methods disclosed herein may be used inconjunction with testing methodologies that incorporate intermediateverification of known good dies to increase the yield and decreasecosts.

FIG. 1A to FIG. 1K are schematic cross-sectional views illustrating amanufacturing process of a package 10 in accordance with someembodiments of the disclosure. Referring to FIG. 1A, a semiconductorsubstrate 110 is provided. The semiconductor substrate 110 may be madeof elemental semiconductor materials, such as crystalline silicon,diamond, or germanium; compound semiconductor materials, such as siliconcarbide, gallium arsenic, indium arsenide, or indium phosphide; or alloysemiconductor materials, such as silicon germanium, silicon germaniumcarbide, gallium arsenic phosphide, or gallium indium phosphide. Thesemiconductor substrate 110 may be a bulk silicon substrate, asilicon-on-insulator (SOI) substrate, or a germanium-on-insulator (GOI)substrate. In some embodiments, the semiconductor substrate 110 has adevice 120 formed therein. The device 120 may include active components(e.g., transistors or the like) and/or passive components (e.g.,resistors, capacitors, inductors, or the like). For simplicity, onedevice 120 is shown in FIG. 1A. However, it should be understood thatmore than one devices may be formed in the semiconductor substrate 110.

As illustrated in FIG. 1A, an interconnection structure 130 is formed onthe semiconductor substrate 110. In some embodiments, theinterconnection structure 130 includes a dielectric layer 132, aplurality of conductive patterns 134, and a plurality of conductive vias136. For simplicity, the dielectric layer 132 is illustrated as a singledielectric layer and the conductive patterns 134 are illustrated asembedded in the dielectric layer 132. Nevertheless, from the perspectiveof the manufacturing process, the dielectric layer 132 is constituted byat least two dielectric layers, and the conductive patterns 134 aresandwiched between two adjacent dielectric layers. In some embodiments,the conductive patterns 134 located at different level heights areconnected to each other through the conductive vias 136. In other words,the conductive patterns 134 are electrically connected to each otherthrough the conductive vias 136. In some embodiments, the bottommostconductive via 136 is connected to the device 120 embedded in thesemiconductor substrate 110. In other words, the bottommost conductivevia 136 establishes electrical connection between the device 120 and theconductive patterns 134 of the interconnection structure 130. In someembodiments, the bottommost conductive via 136 may be referred to as“contact structure” of the device 120.

In some embodiments, the material of the dielectric layer 132 includespolyimide, epoxy resin, acrylic resin, phenol resin, benzocyclobutene(BCB), polybenzooxazole (PBO), or any other suitable polymer-baseddielectric material. The dielectric layer 132, for example, may beformed by suitable fabrication techniques such as spin-on coating,chemical vapor deposition (CVD), plasma-enhanced chemical vapordeposition (PECVD), or the like. In some embodiments, a material of theconductive patterns 134 and the conductive vias 136 include aluminum,titanium, copper, nickel, tungsten, or alloys thereof. The conductivepatterns 134 and the conductive vias 136 may be formed by, for example,electroplating, deposition, and/or photolithography and etching. In someembodiments, the conductive patterns 134 and the underlying conductivevias 136 may be formed simultaneously. It should be noted that thenumber of the dielectric layers 132, the number of the conductivepatterns 134, and the number of the conductive vias 136 illustrated inFIG. 1A are merely for illustrative purposes, and the disclosure is notlimited thereto. In some alternative embodiments, fewer or more layersof the dielectric layers 132, the conductive patterns 134, or theconductive vias 136 may be formed depending on the circuit design.

As illustrated in FIG. 1A, a conductive pad 140 is formed over theinterconnection structure 130. In some embodiments, the conductive pad140 is electrically connected to the conductive patterns 134 of theinterconnection structure 130 through the topmost conductive via 136. Insome embodiments, the conductive pad 140 is used to establish electricalconnection with other components (not shown) or dies (not shown)subsequently formed or provided. In some alternative embodiments, theconductive pad 140 may be a test pad used to probe the subsequentlyformed wafer substrate WS (shown in FIG. 1C) in which the conductive pad140 is included. In some embodiments, the conductive pad 140 may be analuminum pad, a copper pad, or other suitable metal pad. For simplicity,one conductive pad 140 is shown in FIG. 1A. However, it should beunderstood that more than one conductive pads may be formed over theinterconnection structure 130. The number and shape of the conductivepad 140 may be selected based on demand.

Referring to FIG. 1B, a passivation layer 150 is formed over theinterconnection structure 130 and the conductive pad 140. In someembodiments, a material of the passivation layer 150 includes oxides,such as silicon oxide or the like. Alternatively, the passivation layer150 may include polyimide, epoxy resin, acrylic resin, phenol resin,BCB, PBO, or any other suitable polymer-based dielectric material. Thepassivation layer 150, for example, may be formed by suitablefabrication techniques, such as spin-on coating, CVD, PECVD, or thelike.

Referring to FIG. 1C, a plurality of bonding vias 160 and a bondinglayer 170 are formed to obtain a wafer substrate WS. In someembodiments, the wafer substrate WS has a first region R1 and secondregions R2. In some embodiments, the first region R1 surrounds thesecond regions R2. As illustrated in FIG. 1C, the bonding vias 160 areformed to penetrate through the passivation layer 150 and at least partof the dielectric layer 132 of the interconnection structure 130 toestablish electrical connection with the conductive patterns 134 of theinterconnection structures 130. The bonding layer 170 is formed over thepassivation layer 150 and the bonding vias 160. In some embodiments, thebonding layer 170 includes a dielectric layer 172, a plurality ofbonding pads 174, and a plurality of dummy bonding pads 176. In someembodiments, the bonding pads 174 are located in the first region R1while the dummy bonding pads 176 are located in the second regions R2.In some embodiments, the bonding pads 174 and the dummy bonding pads 176are embedded in the dielectric layer 172. In some embodiments, thebonding pads 174 and the dummy bonding pads 176 of the bonding layer 170are electrically connected to the bonding vias 160. That is, the bondingvias 160 electrically connect the interconnection structure 130 with thebonding pads 174 and the dummy bonding pads 176. However, the disclosureis not limited thereto. In some alternative embodiments, the bondingvias 160 directly underneath the dummy bonding pads 176 may be omitted.That is, the dummy bonding pads 176 are not connected to theinterconnection structure 130 and are electrically floating.

In some embodiments, the bonding vias 160, the bonding pads 174, and thedummy bonding pads 176 may be formed via a dual damascene process. Forexample, the dielectric layer 172 is first formed on the passivationlayer 150. In some embodiments, a material of the dielectric layer 172includes oxides, such as silicon oxide or the like. Alternatively, thedielectric layer 172 may include polyimide, epoxy resin, acrylic resin,phenol resin, BCB, PBO, or any other suitable polymer-based dielectricmaterial. The dielectric layer 172, for example, may be formed bysuitable fabrication techniques, such as spin-on coating, CVD, PECVD, orthe like. Subsequently, trenches and via holes (not shown) are formed inthe dielectric layer 172 and the passivation layer 150 by removingportions of theses layers. In some embodiments, a width of the trench isgreater than a width of the via hole. Thereafter, a conductive material(not shown) is filled into the via holes to form the bonding vias 160.Meanwhile, the conductive material (not shown) also fills into thetrenches to from the bonding pads 174 and the dummy bonding pads 176.That is, the bonding vias 160, the bonding pads 174, and the dummybonding pads 176 are formed by simultaneously filling via holes andoverlying trenches (not shown). However, the disclosure is not limitedthereto. In some alternative embodiments, the bonding vias 160 may beformed before the dielectric layer 172, the bonding pads 174, and thedummy bonding pads 176. In some embodiments, a width of each bonding pad174 may be greater than a width of each underlying bonding via 160.Similarly, a width of each dummy bonding pad 176 may be greater than awidth of each underlying bonding via 160. In some embodiments, thebonding vias 160, the bonding pads 174, and the dummy bonding pads 176include the same material. For example, the bonding vias 160, thebonding pads 174, and the dummy bonding pads 176 may be made ofaluminum, titanium, copper, nickel, tungsten, or alloys thereof. In someembodiments, the bonding pads 174 and the dummy bonding pads 176 may besimultaneously formed.

In some embodiments, a top surface of the dielectric layer 172, topsurfaces of the bonding pads 174, and top surfaces of the dummy bondingpads 176 may be collectively referred to as an active surface AS1 of thewafer substrate WS. As shown in FIG. 1C, the top surface of thedielectric layer 172, the top surfaces of the bonding pads 174, and thetop surfaces of the dummy bonding pads 176 are substantially located atthe same level height to provide an appropriate active surface AS1 forhybrid bonding.

Although not illustrated, in some embodiments, some of the bonding vias160 may be disposed directly above the conductive pad 140 to establishelectrical connection between the conductive pad 140 and other elements(for example, the bonding pads 174 directly above the conductive pad140). That is, in some embodiments, some of the conductive pads 140 areelectrically floating while some of the conductive pads 140 are able totransmit signal.

In some embodiments, the arrangement of the bonding pads 174 located inthe first region R1 may be different from the arrangement of the dummybonding pads 176 located in the second regions R2. The configurations ofthe bonding pads 174 and the dummy bonding pads 176 will be describedbelow in conjunction with FIG. 2A.

FIG. 2A is a schematic top view of FIG. 1C. Referring to FIG. 1C andFIG. 2A, the second region R2 is enclosed by the first region R1.However, the disclosure is not limited thereto. In some alternativelyembodiments, the second region R2 may be next to the first region R1.That is, the first region R1 and the second region R2 may be arranged ina side-by-side manner. As illustrated in FIG. 1C and FIG. 2A, a metaldensity in the first region R1 is greater than a metal density in thesecond region R2. Throughout the disclosure, the metal density isreferred to as a volume of metal material within a unit volume. Forexample, within the same volume, the amount of metal material in thefirst region R1 is greater than the amount of metal material in thesecond region R2. Moreover, as illustrated in FIG. 2A, a pattern densityof the bonding pads 174 is greater than a pattern density of the dummybonding pads 176. Throughout the disclosure, the pattern density isreferred to as a percentage of a unit area occupied by metal patternsfrom a top view. For example, within the same area, the number of thebonding pads 174 is greater than the number of the dummy bonding pads176. In some embodiments, a ratio of the pattern density of the dummybonding pads 176 to the pattern density of the bonding pads 174 rangesfrom 1:2.7 to 1:27. For example, the pattern density of the bonding pads174 in the first region R1 may be approximately 27% while the patterndensity of the dummy bonding pads 176 in the second region R2 may beapproximately 1% to approximately 10%.

As illustrated in FIG. 2A, a width W₁₇₄ of each bonding pad 174 issubstantially the same as a width W₁₇₆ of each dummy bonding pads 176.In some embodiments, the width W₁₇₄ of the bonding pads 174 may rangebetween 2.5 μm and 3.5 μm. Similarly, the width W₁₇₆ of the dummybonding pads 176 may also range between 2.5 μm and 3.5 μm. On the otherhand, a pitch P₁₇₄ between two adjacent bonding pads 174 is differentfrom a pitch P₁₇₆ between two adjacent dummy bonding pads 176.Similarly, a spacing S₁₇₄ between two adjacent bonding pads 174 is alsodifferent from a spacing S₁₇₆ between two adjacent dummy bonding pads176. Throughout the disclosure, the pitch P₁₇₄ between two adjacentbonding pads 174 is referred to as a minimum distance between twocenters of the adjacent bonding pads 174, and the pitch P₁₇₆ between twoadjacent dummy bonding pads 176 is referred to as a minimum distancebetween two centers of the adjacent dummy bonding pads 176. On the otherhand, throughout the disclosure, the spacing S₁₇₄ between two adjacentbonding pads 174 is referred to as a minimum distance between edges ofthe adjacent bonding pads 174, and the spacing S₁₇₆ between two adjacentdummy bonding pads 176 is referred to as a minimum distance betweenedges of the adjacent dummy bonding pads 176. In some embodiments, thepitch P₁₇₄ between two adjacent bonding pads 174 ranges between 6 μm and9 μm. On the other hand, the pitch P₁₇₆ between two adjacent dummybonding pads 176 is greater than 10 μm. For example, the pitch P₁₇₆between two adjacent dummy bonding pads 176 ranges between 11 μm and 30μm. That is, the pitch P₁₇₆ between two adjacent dummy bonding pads 176is greater the pitch P₁₇₄ between two adjacent bonding pads 174. In someembodiments, the spacing S₁₇₄ between two adjacent bonding pads 174ranges between 2.5 μm and 6.5 μm. On the other hand, the spacing S₁₇₆between two adjacent dummy bonding pads 176 ranges between 8.5 μm and27.5 μm. That is, the spacing S₁₇₄ between two adjacent bonding pads 174is smaller than the spacing S₁₇₆ between two adjacent dummy bonding pads176. As illustrated in FIG. 2A, by varying the pitch and the spacingbetween two adjacent patterns, the difference in pattern densities inthe first region R1 and the second region R2 may be achieved. However,the disclosure is not limited thereto. In some alternative embodiments,other configurations of the bonding pads 174 and the dummy bonding pads176 may be adopted to achieve the variation in pattern densities ofdifferent regions. These configurations will be described below inconjunction with FIG. 2B to FIG. 2C.

FIG. 2B and FIG. 2C are respectively schematic top views of FIG. 1C inaccordance with some alternative embodiments of the disclosure.Referring to FIG. 2B, the second region R2 is enclosed by the firstregion R1. However, the disclosure is not limited thereto. In somealternatively embodiments, the second region R2 may be next to the firstregion R1. That is, the first region R1 and the second region R2 may bearranged in a side-by-side manner. As illustrated in FIG. 1C and FIG.2B, a metal density in the first region R1 is greater than a metaldensity in the second region R2. Moreover, as illustrated in FIG. 2B, apattern density of the bonding pads 174 is greater than a patterndensity of the dummy bonding pads 176. In some embodiments, a ratio ofthe pattern density of the dummy bonding pads 176 to the pattern densityof the bonding pads 174 ranges from 1:2.7 to 1:27. For example, thepattern density of the bonding pads 174 in the first region R1 may beapproximately 27% while the pattern density of the dummy bonding pads176 in the second region R2 may be approximately 1% to approximately10%.

As illustrated in FIG. 2B, a width W₁₇₄ of each bonding pad 174 isgreater than a width W₁₇₆ of each dummy bonding pad 176. In someembodiments, the width W₁₇₄ of the bonding pads 174 may range between2.5 μm and 3.5 μm. On the other hand, the width W₁₇₆ of the dummybonding pads 176 may range between 1 μm and 2.3 μm. In some embodiments,a pitch P₁₇₄ between two adjacent bonding pads 174 is substantially thesame as a pitch P₁₇₆ between two adjacent dummy bonding pads 176. Forexample, the pitch P₁₇₄ between two adjacent bonding pads 174 rangesbetween 6 μm and 9 μm. Similarly, the pitch P₁₇₆ between two adjacentdummy bonding pads 176 also ranges between 6 μm and 9 μm. In someembodiments, a spacing S₁₇₄ between two adjacent bonding pads 174 issmaller than a spacing S₁₇₆ between two adjacent dummy bonding pads 176.For example, the spacing P₁₇₄ between two adjacent bonding pads 174ranges between 2.5 μm and 6.5 μm. On the other hand, the spacing S₁₇₆between two adjacent dummy bonding pads 176 ranges between 6.7 μm and 8μm. As illustrated in FIG. 2B, by varying the width of the patterns andthe spacing between two adjacent patterns, the difference in patterndensities in the first region R1 and the second region R2 may beachieved.

Referring to FIG. 2C, the second region R2 is enclosed by the firstregion R1. However, the disclosure is not limited thereto. In somealternatively embodiments, the second region R2 may be next to the firstregion R1. That is, the first region R1 and the second region R2 may bearranged in a side-by-side manner. As illustrated in FIG. 1C and FIG.2C, a metal density in the first region R1 is greater than a metaldensity in the second region R2. Moreover, as illustrated in FIG. 2C, apattern density of the bonding pads 174 is greater than a patterndensity of the dummy bonding pads 176. In some embodiments, a ratio ofthe pattern density of the dummy bonding pads 176 to the pattern densityof the bonding pads 174 ranges from 1:2.7 to 1:27. For example, thepattern density of the bonding pads 174 in the first region R1 may beapproximately 27% while the pattern density of the dummy bonding pads176 in the second region R2 may be approximately 1% to approximately10%.

As illustrated in FIG. 2C, a width W₁₇₄ of each bonding pad 174 issubstantially the same as a width W₁₇₆ of each dummy bonding pads 176.In some embodiments, the width W₁₇₄ of the bonding pads 174 may rangebetween 2.5 μm and 3.5 μm. Similarly, the width W₁₇₆ of the dummybonding pads 176 may also range between 2.5 μm and 3.5 μm. On the otherhand, a pitch P₁₇₄ between two adjacent bonding pads 174 is differentfrom a pitch P₁₇₆ between two adjacent dummy bonding pads 176.Similarly, a spacing S₁₇₄ between two adjacent bonding pads 174 is alsodifferent from a spacing S₁₇₆ between two adjacent dummy bonding pads176. In some embodiments, the pitch P₁₇₄ between two adjacent bondingpads 174 ranges between 6 μm and 9 μm. On the other hand, the pitch P₁₇₆between two adjacent dummy bonding pads 176 ranges between 8 μm and 12.6μm. That is, the pitch P₁₇₆ between two adjacent dummy bonding pads 176is greater the pitch P₁₇₄ between two adjacent bonding pads 174. Forexample, the pitch P₁₇₆ between two adjacent dummy bonding pads 176 isapproximately twice the pitch P₁₇₄ between two adjacent bonding pads174. In some embodiments, the spacing P₁₇₄ between two adjacent bondingpads 174 ranges between 2.5 μm and 6.5 μm. On the other hand, thespacing S₁₇₆ between two adjacent dummy bonding pads 176 ranges between4.5 μm and 15.5 μm. That is, the spacing S₁₇₄ between two adjacentbonding pads 174 is smaller than the spacing S₁₇₆ between two adjacentdummy bonding pads 176. As illustrated in FIG. 2C, the dummy bondingpads 176 are arranged in a staggered manner. That is, the dummy bondingpads 176 in a certain row are not aligned with the dummy bonding pads176 in the immediately adjacent row. As illustrated in FIG. 2C, byarranging the patterns in a staggered manner and by varying the pitchand the spacing between two adjacent patterns, the difference in patterndensities in the first region R1 and the second region R2 may beachieved.

Referring to FIG. 1D, a die 200 is provided. In some embodiments, thedie 200 includes a semiconductor substrate 210, a device 220, aninterconnection structure 230, a conductive pad 240, a passivation layer250, a bonding via 260, a bonding layer 270, and a through semiconductorvia (TSV) 280. In some embodiments, the device 220 is formed in thesemiconductor substrate 210. The semiconductor substrate 210 and thedevice 220 in die 200 are respectively similar to the semiconductorsubstrate 110 and the device 110 in the wafer substrate WS, so thedetailed descriptions thereof are omitted herein.

As illustrated in FIG. 1D, the interconnection structure 230 is disposedon the semiconductor substrate 110. In some embodiments, theinterconnection structure 230 is electrically connected to the device220 formed in the semiconductor substrate 210. In some embodiments, theinterconnection structure 230 includes a dielectric layer 232, aplurality of conductive patterns 234, and a plurality of conductive vias236. The dielectric layer 232, the conductive patterns 234, and theconductive vias 236 of the interconnection structure 230 arerespectively similar to the dielectric layer 132, the conductivepatterns 134, and the conductive vias 136 of the interconnectionstructure 130, so the detailed descriptions thereof are omitted herein.

In some embodiments, the conductive pad 240, the passivation layer 250,and the bonding via 260 are formed over the interconnection structure230. In some embodiments, the conductive pad 240, the passivation layer250, and the bonding via 260 of the die 200 are respectively similar tothe conductive pad 140, the passivation layer 150, and the bonding via160 of the wafer substrate WS, so the detailed descriptions thereof areomitted herein. In some embodiments, the conductive pad 240 iselectrically connected to the interconnection structure 230. In someembodiments, the bonding via 260 is formed to penetrate through thepassivation layer 250 and at least part of the dielectric layer 232 ofthe interconnection structure 230 to establish electrical connectionwith the conductive patterns 234 of the interconnection structures 230.That is, a portion of the bonding via 260 is embedded in the passivationlayer 250 and another portion of the bonding via 260 is embedded in thedielectric layer 232 of the interconnection structure 230.

As illustrated in FIG. 1D, the bonding layer 270 is formed over thepassivation layer 250 and the bonding via 260. In some embodiments, thebonding layer 270 includes a dielectric layer 272 and a plurality ofbonding pads 274. The dielectric layer 272 and the bonding pads 274 ofthe bonding layer 270 are respectively similar to the dielectric layer172 and the bonding pads 174 of the bonding layer 170, so the detaileddescriptions thereof are omitted herein. In some embodiments, thebonding pads 274 are electrically connected to the bonding vias 260.That is, the bonding via 260 electrically connects the interconnectionstructure 230 with the bonding pads 274.

In some embodiments, the TSV 280 is embedded in the semiconductorsubstrate 210 and the dielectric layer 232 of the interconnectionstructure 230. That is, the TSV 280 extends from the semiconductorsubstrate 210 to the interconnection structure 230. For example, aportion of the TSV 280 is embedded in the semiconductor substrate 210while another portion of the TSV 280 is embedded in the dielectric layer232 of the interconnection structure 230. In some embodiments, the TSV280 is directly in contact with the conductive pattern 234 to renderelectrical connection with the interconnection structure 230. Forsimplicity, one TSV 280 is shown in FIG. 1D. However, it should beunderstood that the die 200 may include more than one TSVs.

In some embodiments, the die 200 may be capable of performing storagefunctions. For example, the die 200 may be Dynamic Random Access Memory(DRAM), Resistive Random Access Memory (RRAM), Static Random AccessMemory (SRAM), or the like. However, the disclosure is not limitedthereto. In some alternative embodiments, the die 200 may be CentralProcess Unit (CPU) dies, Graphic Process Unit (GPU) dies,Field-Programmable Gate Array (FPGA), or the like.

As illustrated in FIG. 1D, bottom surfaces of the bonding pads 274 and abottom surface of the dielectric layer 272 may be collectively referredto as an active surface AS2 of the die 200. On the other hand, a surfaceof the die 200 opposite to the active surface AS2 may be referred to asa rear surface RS2 of the die 200. As shown in FIG. 1D, the bottomsurfaces of the bonding pad 274 and the bottom surface of the dielectriclayer 272 are substantially located at the same level height to providean appropriate active surface AS2 for hybrid bonding.

As illustrated in FIG. 1D, the die 200 is placed on the wafer substrateWS such that the die 200 is bonded to the wafer substrate WS. Forsimplicity, one die 200 is shown in FIG. 1D. However, it should beunderstood that more than one dies may be bonded to the wafer substrateWS. In some embodiments, the die 200 may be bonded to the wafersubstrate WS through a hybrid bonding process. In some embodiments, atemperature of the hybrid bonding process ranges from about 150° C. toabout 400° C. The hybrid bonding process will be described in detailbelow.

In some embodiments, the die 200 may be picked-and-placed onto theactive surface AS1 of the wafer substrate WS such that the die 200 iselectrically connected to the wafer substrate WS. In some embodiments,the die 200 is placed such that the active surface AS2 of the die 200 isin contact with the active surface AS1 of the wafer substrate WS.Meanwhile, the bonding pads 274 of the die 200 are substantially alignedand in direct contact with the corresponding bonding pads 174 of thewafer substrate WS. In some embodiments, to facilitate the hybridbonding between the die 200 and the wafer substrate WS, surfacepreparation for bonding surfaces (i.e. the active surface AS1 and theactive surface AS2) of the wafer substrate WS and the die 200 may beperformed. The surface preparation may include surface cleaning andactivation, for example. Surface cleaning may be performed on the activesurfaces AS1, AS2 to remove particles on the bonding surface of thedielectric layer 172, the bonding surfaces of the bonding pads 174, thebonding surface of the dielectric layer 272, and the bonding surfaces ofthe bonding pads 274. In some embodiments, the active surfaces AS1, AS2may be cleaned by wet cleaning, for example. Not only particles areremoved, but also native oxide formed on the bonding surfaces of thebonding pads 174 and the bonding pads 274 may be removed. The nativeoxide formed on the bonding surfaces of the bonding pads 174 and thebonding pads 274 may be removed by chemicals used in wet cleaningprocesses, for example.

After cleaning the active surfaces AS1 of the wafer substrate WS and theactive surfaces AS2 of the die 200, activation of the bonding surfacesof the dielectric layer 172 and the dielectric layer 272 may beperformed for development of high bonding strength. In some embodiments,plasma activation may be performed to treat the bonding surfaces of thedielectric layer 172 and the dielectric layer 272. When the activatedbonding surface of the dielectric layer 172 is in contact with theactivated bonding surface of the dielectric layer 272, the dielectriclayer 172 of the wafer substrate WS and the dielectric layer 272 of thedie 200 are pre-bonded.

After pre-bonding the die 200 onto the wafer substrate WS, hybridbonding of the die 200 and the wafer substrate WS is performed. Thehybrid bonding of the die 200 and the wafer substrate WS may include athermal treatment for dielectric bonding and a thermal annealing forconductor bonding. In some embodiments, the thermal treatment fordielectric bonding is performed to strengthen the bonding between thedielectric layer 172 and the dielectric layer 272. For example, thethermal treatment for dielectric bonding may be performed at temperatureranging from about 200° C. to about 400° C. After performing the thermaltreatment for dielectric bonding, the thermal annealing for conductorbonding is performed to facilitate the bonding between the bonding pads174 and the bonding pads 274. For example, the thermal annealing forconductor bonding may be performed at temperature ranging from about150° C. to about 400° C. After performing the thermal annealing forconductor bonding, the dielectric layer 172 is hybrid bonded to thedielectric layer 272 and the bonding pads 174 are hybrid bonded to thebonding pads 274. For example, the dielectric layer 172 is directly incontact with the dielectric layer 272. Similarly, the bonding pads 174are directly in contact with the bonding pads 274. As such, the bondinglayer 170 of the wafer substrate WS is hybrid bonded to the bondinglayer 270 of the die 200. Although FIG. 1D illustrated that the bondingpads 174 and the bonding pads 274 have sharp corners (the sidewalls areperpendicular to the top/bottom surfaces), the disclosure is not limitedthereto. In some alternative embodiments, after the bonding pads 174 arehybrid bonded to the bonding pads 274, corner rounding of the bondingpads may occur. For example, the corners of the bonding pads 174 facingthe bonding pads 274 are rounded. Similarly, the corners of the bondingpads 274 facing the bonding pads 174 are also rounded. That is, edges ofthe top surface of each bonding pad 174 are rounded. Similarly, edges ofthe bottom surface of each bonding pad 274 are also rounded. Moreover,although FIG. 1D illustrated that the bonding pads 174 and the bondingpads 274 have the same width and sidewalls of the bonding pads 174 arealigned with sidewalls of the bonding pads 274, the disclosure is notlimited thereto. In some alternative embodiments, the width of eachbonding pad 174 may be smaller than or larger than the width of eachbonding pad 274.

As illustrated in FIG. 1D, the die 200 is placed in the first region R1to cover some of the bonding pads 174. In other words, the dummy bondingpads 176 located in the second region R2 do not involve in the hybridbonding process. For example, after the hybrid bonding process, thedummy bonding pads 176 located in the second region R2 are stillexposed. Similarly, some of the bonding pads 174 located in the firstregion R1 are also exposed.

In some embodiments, since the wafer substrate WS is in wafer form andthe die 200 is in chip form, the hybrid bonding process in FIG. 1D maybe referred to as a “chip-on-wafer bonding process.” In someembodiments, since the active surface AS1 of the wafer substrate WS arehybrid bonded to the active surface AS2 of the die 200, the bondingbetween the wafer substrate WS and the die 200 may be considered asface-to-face bonding.

Referring to FIG. 1E, an encapsulant 300 is formed over the wafersubstrate WS to laterally encapsulate the die 200. For example, at leasta portion of the encapsulant 300 is located in the second region R2.That is, the encapsulant 300 covers and directly in contact with thedummy bonding pads 176 located in the second region R2. Meanwhile, theencapsulant 300 also covers some of the bonding pads 174 located in thefirst region R1. In some embodiments, a material of the encapsulant 300includes a molding compound, a polymeric material, such as polyimide,epoxy resin, acrylic resin, phenol resin, BCB, PBO, a combinationthereof, or other suitable polymer-based dielectric materials. In somealternative embodiments, the encapsulant 300 may include silicon oxideand/or silicon nitride. In some embodiments, the encapsulant 300 furtherincludes fillers. Alternatively, the encapsulant 300 may be free offillers. In some embodiments, the encapsulant 300 may be formed by thefollowing steps. First, an encapsulation material (not shown) is formedover the bonding layer 170 to encapsulate the die 200. At this stage,the semiconductor substrate 210 of the die 200 is not revealed and iswell protected by the insulating material. For example, the rear surfaceRS2 of the die 200 is not revealed. In some embodiments, theencapsulation material may be formed by a molding process (such as acompression molding process), a spin-coating process, a CVD process, aPECVD process, an atomic layer deposition (ALD) process, or the like.After the encapsulation material is formed, the encapsulation materialis thinned until the rear surface RS2 of the die 200 is exposed, so asto form the ecnapsulant 300 aside the die 200. In some embodiments, theencapsulation material may be thinned or planarized through a grindingprocess, such as a mechanical grinding process, a chemical mechanicalpolishing (CMP) process, or the like. As illustrated in FIG. 1E, therear surface RS2 of the die 200 is substantially coplanar with a topsurface of the encapsulant 300. In some embodiments, the encapsulant 300may be referred to as “gap fill oxide.”

Referring to FIG. 1E and FIG. 1F, the die 200 and the encapsulant 300are further thinned until the TSV 280 is exposed. That is, the die 200is thinned from the rear surface RS2. In some embodiments, the die 200and the encapsulant 300 may be thinned or planarized through a grindingprocess, such as a mechanical grinding process, a CMP process, or thelike. In some embodiments, after the TSV 280 is exposed, the die 200 andthe encapsulant 300 may be further thinned to reduce the overallthickness of the die 200. After the thinning process, a rear surfaceRS2′ of the die 200 is substantially coplanar with a top surface of theencapsulant 300. As illustrated in FIG. 1F, after the thinning process,the TSV 280 penetrates through the semiconductor substrate 210 of thedie 200.

Referring to FIG. 1G, a portion of the die 200 is removed to form arecess R. For example, a portion of the semiconductor substrate 210 ofthe die 200 is removed to form the recess R. As illustrated in FIG. 1G,the TSV 280 is partially located in the recess R. In some embodiments,at least a portion of the TSV 280 protrudes from the semiconductorsubstrate 210 of the die 200. That is, a top surface of the TSV 280 andthe top surface of the encapsulant 300 are located at a level heighthigher than a rear surface RS2″ of the die 200. In some embodiments, thesemiconductor substrate 210 may be partially removed through an etchingprocess. The etching process includes, for example, an isotropic etchingprocess and/or an anisotropic etching process. For example, thesemiconductor substrate 210 may be partially removed through a wetetching process, a drying etching process, or a combination thereof.

Referring to FIG. 1G and FIG. 1H, a protection layer 400 is formed tofill the recess R. In some embodiments, the protection layer 400includes a molding compound, a molding underfill, or the like.Alternatively, the protection layer 400 may be made of a polymericmaterial, such as polyimide, epoxy resin, acrylic resin, phenol resin,BCB, PBO, or other suitable polymer-based dielectric materials. In someembodiments, the protection layer 400 may include fillers.Alternatively, the protection layer 400 may be free of fillers. Asillustrated in FIG. 1H, the protruding portion of the TSV 280 islaterally encapsulated by the protection layer 400. In some embodiments,the protection layer 400 may be formed by the following steps. First, aprotection material layer (not shown) is formed in the recess R and overthe encapsulant 300. Subsequently, a grinding or thinning process isperformed on the protection material layer until the TSV 280 isrevealed. The thinning process includes, for example, a mechanicalgrinding process, a CMP process, or the like. As illustrated in FIG. 1H,the encapsulant 300 laterally encapsulates the protection layer 400.

Referring to FIG. 1I, a redistribution structure 500 and an inductor 600are formed over the die 200, the encapsulant 300, and the protectionlayer 400. In some embodiments, the redistribution structure 500includes a dielectric layer 502, a plurality of conductive patterns 504,and a plurality of conductive vias 506. For simplicity, the dielectriclayer 502 is illustrated as a single dielectric layer and the conductivepatterns 504 are illustrated as embedded in the dielectric layer 502.Nevertheless, from the perspective of the manufacturing process, thedielectric layer 502 is constituted by at least two dielectric layers,and the conductive patterns 504 are sandwiched between two adjacentdielectric layers. In some embodiments, the conductive patterns 504located at different level heights are connected to each other throughthe conductive vias 506. In other words, the conductive patterns 504 areelectrically connected to each other through the conductive vias 506. Insome embodiments, the bottommost conductive pattern 504 is directly incontact with the TSV 280 of the die 200. In other words, theredistribution structure 500 is electrically connected to the die 200.

In some embodiments, the material of the dielectric layer 502 includespolyimide, epoxy resin, acrylic resin, phenol resin, BCB, PBO, or anyother suitable polymer-based dielectric material. The dielectric layer502, for example, may be formed by suitable fabrication techniques suchas spin-on coating, CVD, PECVD, or the like. In some embodiments, amaterial of the conductive patterns 504 and the conductive vias 506includes aluminum, titanium, copper, nickel, tungsten, or alloysthereof. The conductive patterns 504 and the conductive vias 506 may beformed by, for example, electroplating, deposition, and/orphotolithography and etching. In some embodiments, the conductivepatterns 504 and the underlying conductive vias 506 may be formedsimultaneously. It should be noted that the number of the dielectriclayers 502, the number of the conductive patterns 504, and the number ofthe conductive vias 506 illustrated in FIG. 1I are merely forillustrative purposes, and the disclosure is not limited thereto. Insome alternative embodiments, fewer or more layers of the dielectriclayers 502, the conductive patterns 504, or the conductive vias 506 maybe formed depending on the circuit design.

As illustrated in FIG. 1I, the inductor 600 is embedded in theredistribution structure 500. For example, the inductor 600 is embeddedin the dielectric layer 502 of the redistribution structure 500. In someembodiments, the inductor 600 is electrically connected to theconductive patterns 504 through the conductive via 506. In someembodiments, a material of the inductor 600 includes aluminum, titanium,copper, nickel, tungsten, or alloys thereof. In some embodiments, thematerial of the inductor 600 may be the same as the conductive patterns504 of the redistribution structure 500. Alternatively, the material ofthe inductor 600 may be different from the conductive patterns 504 ofthe redistribution structure 500. In some embodiments, the inductor 600and the bottommost conductive patterns 504 of the redistributionstructure 500 are located at the same level height. For example, theinductor 600 and the bottommost conductive patterns 504 may besimultaneously formed through the same process. In some embodiments, theinductor 600 is directly in contact with the encapsulant 300. Theconfiguration of the bonding pads 174, the dummy bonding pads 176, thedie 200, and the inductor 600 will be described below in conjunctionwith FIG. 3 .

FIG. 3 is a schematic top view of FIG. 1I. For simplicity, elementsother than the bonding pads 174, the dummy bonding pads 176, the die200, and the inductor 600 are omitted in FIG. 3 . Referring to FIG. 1Iand FIG. 3 , the first region R1 surrounds the second region R2. In someembodiments, the bonding pads 174 are located in the first region R1 andthe dummy bonding pads 176 are located in the second region R2. In someembodiments, the die 200 is located in the first region R1 and coverssome of the bonding pads 174. On the other hand, the inductor 600 islocated in the second region R2 and covers/overlaps with the dummybonding pads 176. That is, the inductor 600 is located directly abovethe dummy bonding pads 176. As mentioned above, the pattern density ofthe bonding pads 174 in the first region R1 is greater than the patterndensity of the dummy bonding pads 176 in the second region R2. Moreover,the metal density of the second region R2 is smaller than the metaldensity of the first region R1. Since the inductor 600 is located in thesecond region R2, less metal is overlapped with the inductor 600. Assuch, RLC performance degradation derived from overlapping of aninductor with large area of metal may be alleviated, thereby enhancingthe quality factor of the inductor. As illustrated in FIG. 3 , theinductor 600 takes the form of rectangular coil. However, the disclosureis not limited thereto. In some alternative embodiments, the inductor600 may take the form of circular coil, triangular coil, polygonal coil,or the like.

It should be noted that although the configuration of the bonding pads174 and the dummy bonding pads 176 in FIG. 3 is similar to that of FIG.2A, the disclosure is not limited thereto. The bonding pads 174 and thedummy bonding pads 176 in FIG. 3 may also adopt the configurations asshown in FIG. 2B or FIG. 2C.

Referring to FIG. 1J, a plurality of bump pads 700 is formed over theredistribution structure 500. In some embodiments, a material of thebump pads 700 includes aluminum, titanium, copper, nickel, tungsten, oralloys thereof. In some embodiments, the material of the bump pads 700are different from the conductive patterns 504 of the redistributionstructure 500. For example, the conductive patterns 504 of theredistribution structure 500 may be made of copper while the bump pads700 may be made of aluminum. However, the disclosure is not limitedthereto. In some alternative embodiments, the material of the bump pads700 may be the same as the material of the conductive patterns 504 ofthe redistribution structure 500. In some embodiments, the bump pads 700may be formed by, for example, electroplating, deposition, and/orphotolithography and etching. In some embodiments, the bump pads 700 areelectrically connected to the conductive patterns 504 of theredistribution structure 500.

Referring to FIG. 1K, a passivation layer 800 and a plurality ofconductive terminals 900 are sequentially formed over the redistributionstructure 500 and the bump pads 700. In some embodiments, a material ofthe passivation layer 800 includes oxides, such as silicon oxide or thelike. Alternatively, the passivation layer 800 may include polyimide,epoxy resin, acrylic resin, phenol resin, BCB, PBO, or any othersuitable polymer-based dielectric material. The passivation layer 800,for example, may be formed by suitable fabrication techniques, such asspin-on coating, CVD, PECVD, or the like. In some embodiments, thepassivation layer 800 is formed to expose at least a portion of the bumppads 700.

As illustrated in FIG. 1K, the conductive terminals 900 are formed onthe exposed portion of the bump pads 700. In some embodiments, aplurality of under-bump metallurgy (UBM) patterns (not shown) may beoptionally provided between the conductive terminal 900 and the bumppads 700. In some embodiments, the conductive terminals 900 are attachedto the bump pads 700/the UBM patterns through a solder flux. In someembodiments, the conductive terminals 900 are, for example, solderballs, ball grid array (BGA) balls, or controlled collapse chipconnection (C4) bumps. In some embodiments, the conductive terminals 900are made of a conductive material with low resistivity, such as Sn, Pb,Ag, Cu, Ni, Bi, or an alloy thereof.

After the conductive terminals 900 are formed, a singulation process isperformed to form a plurality of packages 10. In some embodiments, thedicing process or the singulation process typically involves dicing witha rotating blade or a laser beam. In other words, the dicing orsingulation process is, for example, a laser cutting process, amechanical cutting process, or other suitable processes. In someembodiments, during the singulation process, the wafer substrate WS isdivided into a plurality of dies 100. That is, each die 100 includes thesemiconductor substrate 110, the device 120, the interconnectionstructure 130, the conductive pad 140, the passivation layer 150, thebonding vias 160, and the bonding layer 170.

As illustrated in FIG. 1K, the package 10 has the first region R1 andthe second region R2. The first region R1 surrounds the second regionR2. The die 200 is stacked on and bonded to the die 100. In other words,multiple dies 100 and 200 are integrated into a single package 10. Assuch, the package 10 may be referred to as a “system on integratedcircuit (SOIC) package.” In some embodiments, the die 100 has a bondinglayer 170, and the bonding layer 170 includes bonding pads 174 locatedin the first region R1 and dummy bonding pads 176 located in the secondregion R2. The pattern density of the dummy bonding pads 176 is smallerthan the pattern density of the bonding pads 174. The encapsulant 300 isaside the die 200 and laterally encapsulates the die 200. In someembodiments, at least a portion of the encapsulant 300 is located in thesecond region R2. In some embodiments, the inductor 600 is located inthe second region R2. That is, the inductor 600 is directly above thedummy bonding pads 176. Since the dummy bonding pads 176 has low patterndensity, the inductor 600 is subjected to less RLC performancedegradation, and the quality factor of the inductor 600 may be enhanced.

FIG. 4 is a schematic cross-sectional view illustrating a package 20 inaccordance with some alternative embodiments of the disclosure.Referring to FIG. 4 , the package 20 in FIG. 4 is similar to the package10 in FIG. 1K, so similar elements are denoted by the same referencenumeral and the detailed descriptions thereof are omitted herein. Asillustrated in FIG. 4 , the inductor 600 is embedded in the die 100. Forexample, the inductor 600 is embedded in the interconnection structure130 of the die 100. In some embodiments, the inductor 600 and thetopmost conductive patterns 134 of the interconnection structure 130 arelocated at the same level height. For example, the inductor 600 and thetopmost conductive patterns 134 may be simultaneously formed through thesame process. In some embodiments, the inductor 600 is electricallyconnected to the conductive patterns 134 of the interconnectionstructure 130. In some embodiments, the inductor 600 is isolated fromthe dummy bonding pads 176. For example, the inductor 600 iselectrically isolated from the dummy bonding pads 176. In someembodiments, the inductor 600 is located in the second region R2 of thepackage 20 and covers/overlaps with the dummy bonding pads 176. That is,the inductor 600 is located directly below the dummy bonding pads 176.As mentioned above, the pattern density of the bonding pads 174 in thefirst region R1 is greater than the pattern density of the dummy bondingpads 176 in the second region R2. Moreover, the metal density of thesecond region R2 is smaller than the metal density of the first regionR1. Since the inductor 600 is located in the second region R2, lessmetal is overlapped with the inductor 600. As such, RLC performancedegradation derived from overlapping of an inductor with large area ofmetal may be alleviated, thereby enhancing the quality factor of theinductor.

It should be noted that the configuration of the bonding pads 174 andthe dummy bonding pads 176 illustrated in FIG. 2A, FIG. 2B, and FIG. 2Care also applicable to the package 20 shown in FIG. 4 .

In accordance with some embodiments of the disclosure, a package has afirst region and a second region. The package includes a first die, asecond die, an encapsulant, and an inductor. The second die is stackedon and bonded to the first die. The encapsulant is aside the second die.At least a portion of the encapsulant is located in the second region.The inductor is located in the second region. A metal density in thefirst region is greater than a metal density in the second region.

In accordance with some alternative embodiments of the disclosure, apackage includes a first die, a second die, an encapsulant, and aninductor. The first die includes bonding pads and dummy bonding pads. Apattern density of the bonding pads is greater than a pattern density ofthe dummy bonding pads. The second die is bonded to the first die. Thesecond die covers the bonding pads. The encapsulant is disposed on thefirst die. The encapsulant laterally encapsulates the second die andcovers the dummy bonding pads. The inductor is over the dummy bondingpads.

In accordance with some embodiments of the disclosure, a manufacturingmethod of a package includes at least the following steps. A wafersubstrate having a first region and a second region is provided. Thewafer substrate is provided by at least the following steps. Firstbonding pads having a first pattern density are formed in the firstregion. Dummy bonding pads having a second pattern density are formed inthe second region. The first pattern density is greater than the secondpattern density. Subsequently, a die is placed on the first region ofthe wafer substrate. The die includes second bonding pads hybrid bondedto the first bonding pads. The die is encapsulated by an encapsulant. Aninductor is formed over the second region.

The foregoing outlines features of several embodiments so that thoseskilled in the art may better understand the aspects of the presentdisclosure. Those skilled in the art should appreciate that they mayreadily use the present disclosure as a basis for designing or modifyingother processes and structures for carrying out the same purposes and/orachieving the same advantages of the embodiments introduced herein.Those skilled in the art should also realize that such equivalentconstructions do not depart from the spirit and scope of the presentdisclosure, and that they may make various changes, substitutions, andalterations herein without departing from the spirit and scope of thepresent disclosure.

What is claimed is:
 1. A package having a first region and a secondregion encircled by the first region, comprising: a first die, locatedin both the first region and the second region; a second die bonded tothe first die, wherein the second die is completely located within thefirst region; an encapsulant laterally encapsulating the second die,wherein the encapsulant is located in both the first region and thesecond region; and an inductor completely located within the secondregion, wherein a metal density in the first region is greater than ametal density in the second region.
 2. The package of claim 1, whereinthe first die comprises: a semiconductor substrate; an interconnectionstructure over the semiconductor substrate; a passivation layer over theinterconnection structure; a bonding layer over the passivation layer,wherein the bonding layer comprises bonding pads located in the firstregion and dummy bonding pads located in the second region, and apattern density of the bonding pads is greater than a pattern density ofthe dummy bonding pads; and bonding vias penetrating through thepassivation layer, wherein the bonding vias electrically connect theinterconnection structure and the bonding pads.
 3. The package of claim2, wherein the inductor is embedded in the interconnection structure. 4.The package of claim 2, wherein the dummy bonding pads are electricallyfloating.
 5. The package of claim 2, wherein a ratio of the patterndensity of the dummy bonding pads to the pattern density of the bondingpads ranges from 1:2.7 to 1:27.
 6. The package of claim 2, wherein aspacing between two adjacent bonding pads is smaller than a spacingbetween two adjacent dummy bonding pads.
 7. The package of claim 2,wherein a width of each bonding pad is greater than a width of eachdummy bonding pad.
 8. The package of claim 1, further comprising aredistribution structure over the second die and the encapsulant,wherein the inductor is embedded in the redistribution structure.
 9. Apackage, comprising: a first die, comprising dummy bonding pads andbonding pads surrounding the dummy bonding pads, wherein a patterndensity of the bonding pads is greater than a pattern density of thedummy bonding pads; a second die disposed on some of the bonding pads;an encapsulant adjacent to the second die, wherein the encapsulant isdirectly in contact with the dummy bonding pads and the rest of thebonding pads; and an inductor vertically overlapped with the dummybonding pads.
 10. The package of claim 9, wherein the dummy bonding padsare electrically floating.
 11. The package of claim 9, wherein theinductor is embedded in the first die.
 12. The package of claim 9,further comprising a redistribution structure over the second die andthe encapsulant, wherein the inductor is embedded in the redistributionstructure.
 13. The package of claim 9, wherein the encapsulant isfurther in direct contact with the inductor.
 14. The package of claim 9,wherein a spacing between two adjacent bonding pads is smaller than aspacing between two adjacent dummy bonding pads.
 15. The package ofclaim 9, wherein a width of each bonding pad is greater than a width ofeach dummy bonding pad.
 16. A manufacturing method of a package,comprising: providing a wafer substrate having a first region and asecond region encircled by the first region, comprising: forming bondingpads having a first pattern density in the first region; and formingdummy bonding pads having a second pattern density in the second region,wherein the first pattern density is greater than the second patterndensity, and the bonding pads and the dummy bonding pads aresimultaneously formed; bonding a die to some of the bonding pads of thewafer substrate, wherein the die is completely located within a span ofthe first region; laterally encapsulating the die by an encapsulant; andforming an inductor over the second region.
 17. The method of claim 16,wherein at least a portion of the encapsulant is formed to be locatedover the second region.
 18. The method of claim 17, wherein the inductoris formed to be in direct contact with the portion of the encapsulantlocated over the second region.
 19. The method of claim 16, furthercomprising: forming a redistribution structure over the die and theencapsulant, wherein the inductor is formed in the redistributionstructure; and forming conductive terminals over the redistributionstructure.
 20. The method of claim 16, wherein the dummy bonding padsare formed to be electrically floating.